<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb>
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>
        <a href="/params">商品管理</a>
      </el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 警示框区域 -->
      <el-alert title="警告：只允许对三级分类进行操作" type="warning" show-icon :closable="false"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类为：</span>
          <!--联级选择器 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数添加页面 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <el-table :data="manyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环显示Tag标签 -->
                <el-tag
                  v-for="(item , i) in scope.row.attr_vals"
                  closable="true"
                  :key="i"
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性添加页面 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环显示Tag标签 -->
                <el-tag
                  v-for="(item , i) in scope.row.attr_vals"
                  closable="true"
                  :key="i"
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- dialog添加属性对话框 -->
    <el-dialog
      :title="'添加'+tittleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 验证表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="tittleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑属性对话框 -->
    <el-dialog
      :title="'添加'+tittleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 验证表单 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="tittleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 联级选择框的配置对象
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签标签
      activeName: "many",
      // 动态属性保存
      manyTableData: [],
      // 静态属性保存
      onlyTableData: [],
      // 控制添加对话框的显示
      addDialogVisible: false,
      // 添加分类数据数组
      addForm: {
        attr_name: ""
      },
      // 添加表单的验证对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur"
          }
        ]
      },
      // 控制修改对话框的显示
      editDialogVisible: false,
      // 修改属性数组
      editForm: {},
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur"
          }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  computed: {
    // 如果按钮需要被禁用，返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的分类id
    getCateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    // 动态计算标题文本
    tittleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态参数";
    }
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类信息失败");
      }
      this.cateList = res.data;
      console.log(this.cateList);
    },
    // 级联选择框选中的信息发生变化会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      console.log(this.selectedCateKeys);
      // 根据所选分类的id和对应面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.getCateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败！");
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split("") : [];
        // 控制文本框的显示
        item.inputVisible = false;
        // 文本框中输入的值
        item.inputValue = "";
      });

      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    // tab标签页点击事件触发的函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    // 监听表单的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.getCateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加失败！");
        }
        this.$message.success("添加成功！");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 得到参数信息
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.getCateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败");
      }
      this.editForm = res.data;
      this.getParamsData();
      this.editDialogVisible = true;
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.getCateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败");
        }
        this.$message.success("修改参数成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 根据id删除参数项
    async removeParams(attrId) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除！");
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.getCateId}/attributes/${attrId}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败！");
      }
      this.$message.success("删除参数成功！");
      this.getParamsData();
    },
    // 当文本失去焦点或者摁下了enter键都会触发
    handleInputConfirm(row) {
      // 输入的内容为空时，清空
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      // 提交数据库，保存修改
      this.saveAttrVals(row);
    },
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.getCateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" ")
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败！");
      }
      this.$message.success("修改参数项成功！");
    },
    // 点击按钮显示文本框
    showInput(row) {
      row.inputVisible = true;
      //   让输入框自动获取焦点
      // $nextTick方法的作用：当页面元素被重新渲染之后，才会至指定回调函数中的代码
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除标签
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    }
  }
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 15px;
}

.input-new-tag {
  width: 120px;
}
</style>